Hi!
Some time ago I wrote a custom content provider which
builds a DOM tree from scratch based on my application data.
It implements get_dom which, would be the most efficient way
to hand over the XML and get_strref by using the toString method.
Now I want to optimise timing and had to find out that
get_strref is allways called by the AxKit core.
It seems that the style handling code needs it, even
if I provide a get_styles which sets the styles without
using the super class method.
I even removed all AxAddProcessor statements from httpd.conf
but didnt get a change in behaviour.
The request logged in http error_log:
--- cut here ---
[Mon Feb 6 18:15:27 2006] [info] Using Apache::RequestNotes
[Mon Feb 6 18:15:27 2006] [info] Exiting Apache::RequestNotes
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] fast
handler called for /nax/index.nax
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] Content
Provider Override: elimpex::Apache::AxKit::Provider::Nina
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] checking
if we process this resource
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] media:
screen, preferred style: #default
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] Cache: key
= a83e8d4ebbc3ee017deb50507435898d
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] getting
styles and external entities from the XML
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] styles not
cached - calling $provider->get_styles()
[Mon Feb 6 18:15:29 2006] [debug]
/home/elimpex/perl/lib/elimpex/Apache/AxKit/Provider/Nina.pm(233):
[client 10.42.0.14] get_styles
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] resetting
cache with no preferred style (#default ne )
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] Cache: key
= 16cdb7673390bbdc70a1435b5613ce2b
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] cache
doesn't exist
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] some
condition failed. recreating output
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] styles:
(/styles/nax.xsl)
[Mon Feb 6 18:15:29 2006] [debug]
/home/elimpex/perl/lib/elimpex/Apache/AxKit/Provider/Nina.pm(203):
[client 10.42.0.14] get_strref
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] Style
Provider Override: Apache::AxKit::Provider::File
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] encoding
to UTF-8
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [uri] File
Provider looking up uri (/styles/nax.xsl)
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] decoding
from UTF-8
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [uri] File
Provider set filename to /home/elimpex/www/styles/nax.xsl
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] about to
execute: Apache::AxKit::Language::LibXSLT::handler
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
getting the XML
[Mon Feb 6 18:15:29 2006] [debug]
/home/elimpex/perl/lib/elimpex/Apache/AxKit/Provider/Nina.pm(167):
[client 10.42.0.14] get_dom
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
parsing stylesheet
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
parsing stylesheet /styles/nax.xsl
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit]
Provider::get_dom
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit]
Provider::get_dom/parse_fh(GLOB(0x8d1be18), /styles/nax.xsl)
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
performing transformation
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
transformation finished, creating XML::LibXML::Document=SCALAR(0x8d1beb4)
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
outputting to $r
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] [LibXSLT]
storing results in pnotes(dom_tree) (AxKit::Apache=SCALAR(0x88e5bdc))
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit]
Apache::AxKit::Language::LibXSLT::handler finished with code 0
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] execution
of: Apache::AxKit::Language::LibXSLT::handler finished
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] delivering
to browser
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] Delivering
xml_string
[Mon Feb 6 18:15:29 2006] [warn] [client 10.42.0.14] [AxKit] writing
xml string to browser
--- cut here ---
The lines with "[debug]
/home/elimpex/perl/lib/elimpex/Apache/AxKit/Provider/Nina.pm"
are at the start of the methods get_styles, get_strref and get_dom of my
provider code.
As you may see, get_styles is called first, so AxKit should know which
styles
to use for the pipeline. Then get_strref is called right after the styles
are defined. Then at last get_dom is called, to hand over the XML into
the built pipeline.
At least thats how I interprete this log - maybe someone can bring some more
light in here.
If I remove the get_strref method, I get this in http error_log:
--- cut here ---
[Mon Feb 6 18:01:36 2006] [info] Using Apache::RequestNotes
[Mon Feb 6 18:01:36 2006] [info] Exiting Apache::RequestNotes
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] fast
handler called for /nax/index.nax
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] Content
Provider Override: elimpex::Apache::AxKit::Provider::Nina
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] checking
if we process this resource
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] media:
screen, preferred style: #default
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] Cache: key
= a83e8d4ebbc3ee017deb50507435898d
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] getting
styles and external entities from the XML
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] styles not
cached - calling $provider->get_styles()
[Mon Feb 6 18:01:37 2006] [debug]
/home/elimpex/perl/lib/elimpex/Apache/AxKit/Provider/Nina.pm(236):
[client 10.42.0.14] get_styles
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] resetting
cache with no preferred style (#default ne )
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] Cache: key
= 16cdb7673390bbdc70a1435b5613ce2b
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] cache
doesn't exist
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] some
condition failed. recreating output
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] styles:
(/styles/nax.xsl)
[Mon Feb 6 18:01:37 2006] [warn] [client 10.42.0.14] [AxKit] Caught an
exception
[Mon Feb 6 18:01:37 2006] [error] [client 10.42.0.14] [AxKit] [Error]
Subclass must implement get_strref
[Mon Feb 6 18:01:37 2006] [error] [client 10.42.0.14] [AxKit] From:
/usr/lib/perl5/site_perl/5.8.0/Error.pm : 148
[Mon Feb 6 18:01:37 2006] [error] [client 10.42.0.14] [AxKit]
[Backtrace] Subclass must implement get_strref at
/usr/lib/perl5/site_perl/5.8.0/Error.pm line
148\n\tError::throw('Apache::AxKit::Exception::Error','-text','Subclass
must implement get_strref') called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/Apache/AxKit/Provider.pm
line
123\n\tApache::AxKit::Provider::get_strref('elimpex::Apache::AxKit::Provider::Nina=HASH(0x8514434)')
called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/AxKit.pm line
720\n\tAxKit::process_request('AxKit::Apache=SCALAR(0x88e5bdc)','elimpex::Apache::AxKit::Provider::Nina=HASH(0x8514434)','ARRAY(0x83ac594)','undef')
called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/AxKit.pm line
478\n\tAxKit::run_axkit_engine('AxKit::Apache=SCALAR(0x88e5bdc)','elimpex::Apache::AxKit::Provider::Nina=HASH(0x8514434)')
called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/AxKit.pm line
304\n\teval {...} called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/AxKit.pm line
295\n\tAxKit::main_handler('AxKit::Apache=SCALAR(0x88e5bdc)','elimpex::Apache::AxKit::Provider::Nina=HASH(0x8514434)')
called at
/usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi/AxKit.pm line
208\n\tAxKit::fast_handler('AxKit::Apache=SCALAR(0x88e5bdc)') called at
/dev/null line 0\n\teval {...} called at /dev/null line 0\n
--- cut here ---
The AxKit man pages and the book clearly say any ONE of
get_strref, get_dom or get_fh must be implemented, so why
is AxKit insiting on get_strref if get_dom is available ?
Is there a way to do it with get_dom and without get_strref?
Which part of AxKit needs the XML as string and can it be
avoided ?
Thanks for any hints!
Bye, Peter
WOTLmade
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